With the ExitDoorShield in position the door handle is secured. However, in the event of an emergency the door can be opened by pressing down the door handle in one single movement which ensures the ExitDoorShield moves vertically to free the handle. To deter improper use of the ExitDoorShield in a non emergency situation as soon as the door handle touches the door guard housing an optional pre alarm can be fitted which warns against unauthorised use. This pre alarm stops if the handle is released. If the door handle is pushed down completely a permanent alarm is emitted and people can pass through the emergency exit door. The ExitDoorShield can then only be reset to its protective position and the alarm stopped with a key. It is also possible to release the ExitDoorShield with the key for authorised passage without triggering the alarm.
